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Abstract

Hand-held devices are provided for both scanning and decoding coded images such as two-dimensional bar codes. A linear scanning array of image sensing elements in the scanner/decoder provides image data with pixel-to-pixel synchronism, but lacking scan-to-scan synchronism as the scanning array is moved transversely across the bar code image. No tracking ball or roller is included to provide data enabling scan-to-scan synchronism. Redundant scan cancellation is employed to delete redundant image data from the stored image, with the adequate representation of coded information taking precedence over storage of a high resolution image. The stored image is sampled to correlate bar code edge pattern elements in order to identify the bounds and orientation of scanned bar code images. The redundancy-reduced stored bar code image is decoded within the hand-held unit, with use of data on bar code bounds and orientation, to provide decoded information for further use. Scanner/decoder devices and methods, and data redundancy reduction methods are described.

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First Claim